Package-specific `build` scripts are broken

[Gudahtt]

Each package has a build script, but this scripts currently fail with the error command not found: ts-bridge.

The top-level build command still works, but on a per-package level the ts-bridge binary is not present. We should fix this by adding ts-bridge to devDependencies for all packages. The package would still get hoisted so that we only have one instance, but this would ensure ts-brigge gets listed in node_modules/.bin for all packages so that it can be invoked by package npm scripts.